package com.cy5;

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    static class TreeNode{
        char val;
        TreeNode left;
        TreeNode right;
        public TreeNode(char val){
            this.val=val;
        }
    }
    TreeNode root;
    private int i=0;
    public  TreeNode creatTree(String s){
        TreeNode root=null;
        if(s.charAt(i)!='#'){
            root=new TreeNode(s.charAt(i));
            i++;
            root.left=creatTree(s);
            root.right=creatTree(s);
        }else{
            i++;
        }
        return root;
    }
    public static void inOrder(TreeNode root){
        if (root == null) {
            return;
        }
        inOrder((root.left));
        System.out.print(root.val+ " ");
        inOrder(root.right);
    }
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Main main = new Main();
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String s= in.nextLine();
            TreeNode root=main.creatTree(s);
            inOrder(root);
        }
    }
}